Chuck mechanism



Oct. 25,1927.

, R. s. BROWN CHUCK MEGHANISM Filed 'June 4, 1925 A TTURNEY PatentedOct. 25, 1927.

UNITE-n srAres PATENT? oFFics.

ROBERT S. BROWN, OF NEW iR'llllfl,V CONECTCUT, ASSEGNOR TO `IHfil NEWBRITAIN MACHINE COMPANY, OF NEV BRITJN, CONNECTCUT, `lo CORPORATION OFCON#- NECTICUT.

' urinoir MnoHAlvIsi/n App1icatio11-i`led June 4, 19.25, SerialNo.34,869. l

Thisinvention relates to chuck mechanism for metalworking machine.

In an application for patent for metal Working machine .liled ljointlyby JohnH. Montstream and Robert SfBroWn, on July 1.85.1924, Serial No.l7 26,7 20, the clutch mechanismdescribed and claimed herein Was`disclosed.but, since said chuclcme'chanism.vvas the-sole invention ofmyself, the said Robert S;.Biown, itis noiv made the subject-matter ofthis separate application.

Ihave a number ofobjects inv-iev', among them beingl the `provision inanappliance of the character set forth. the mechanism of which; is quitesimple in construction 4and positive andy certain in action;thelprovision of a chuck which may be easily and posi; tively adjusted--Other objects will be vapparent as the specification proceeds. Thedevice possesses advantages Whichivill be set forth at" length in thefollowingv description, wherein Ik have: outlined in detail that form ofembodiment of the invention whichA I have selectedfor: illustration inthe drawing accompanying and forming partof the `presv entispecification,` to enable those skilled` in the art to practice theinvention.- l am not restricted to such disclosure; lf may departtherefrom inseveral respects Within the scope of the invention as.denedbythe claims. t

Referring; to the drawing; Y

Fig. l' is an elevation-partly in section of the upper part of astructure involving the invention Fig. 2 is a similar view. on a largerscale of the upper portion of the construction;

Fig. 3 is a vieuT somewhat similar to Fig. 2 and showing a Wrench inposition;

Fig. 4 is a view of a chuck and certain adjunctive devices;

Fig. 5is a similar view7 the section, however, being at right angles tothat of Fig. 4;

Figs. 6 to 9 inclusive are details of the chuck mechanism;

Fig. 10 is a detail in section.

Like characters refer to like parts throughout the ,several views.

One or more chucks may be mounted on a. chuck carrier or turret as 27which is practically in the form of a drum, Which may be rotated step bystep to bring the article or Work in the chucks in position to be actedon by tools (not shown). Each of the chucks may. include asleeve or`chuck body 3 Which receives' Within it a collet 4 having atits end aconical head. 5 fitting a conical seat in the chuck body 3 and heldfromturning motion by .a pm 6 extended through an elongated slot in the bodyof the colletl. The body of the collet l; is longitudinally slotted asat2P so that When drawn back against the conical seat in, the chuck body3, it will close and holdY rigidly the Work being acted on by, thetools. A i

The body of each collet 4c may have a rear extension 8 in the form of aplunger secured thereto as by meansof a screw thread. A block 19 maybeadjustably secured` to the collet 4 or to the extension 8l andmay coactwith means for actuating the collet. lIn the form shown. the bodyportion of .the plunger 8 iongitudinalla7 Slotted as at 7 to receive theblock 10 which slidingly tits the slot 7 L The plunger has a passage Or.elongated slot 9tliroughthe bifuiicated sectionvvhich slot registers inpart with a transversely elongated slot 1 2 in the block 10. The `block10 may beprovidcd, at its rearend with an eX-` ternallythreadedportion13 to receive an adjusting nut 14; Fig. 7) Whichvalso r0tatablyfitsaround thereduced portion 15on the plunger V8. To facilitate assemblythe nut 14 `may be ofthe split type land may be held against turningWithin a ringmember 1G byscreivs 17. Y

A chuck operating shaft 19 is` rotatably mounted in a partpreferablyfiXedWith rela# tion to the chuck body 3 and, as shown, this shaft ismounted in suitable bearings in the turret 2. The shaft may extendthrough the passage 9 in the plunger and through the transverse slot 12in the block 10. That part of the actuating shaft 19 which lies in theslot 12 is eccentric to the axis thereof and preferably makes arelatively close fitl With the opposite walls of the transverse slot 12.The passage or slot 9 is of sufficient size to permit the eccentricportion of the shaft to pass therethrough.

The operation of the device is as follovvs:

rlllie actuating shaft 19 may be turned, as by means of a Wrench 20, andin turning in one direction the eccentric on the shaft 19, acting uponone Wall of the transverse slot 127 will dravv' the collet in adirection to cause the same to be closed. Rotation of the shaft in theopposite direction Will cause the eccentric to act on the opposite Wallof the slot lf2.l and cause the chuck toy be opened.

Vshaft having means for engaging said op-` When it is .desired to makeanV adjustment of the collet jaw openingto compensate for Wear or tprovidefor the reception of Work articles of larger ory smaller size,the block may be moved in either direction in the collet plunger 8 byturning the lnutl on` the threaded end 13 of the block. Since'the nut 14is held against substantial longitudinal movement. on the collet plungerby meansof the reduced portion or spool l5, the block 10 Will bemovedfurther into or outnof the slot?, dependingupon the directionfofrotation ofthe nut 14; y, 'Y It is usually best to adjust the setting ofthe blocklO so thatthe collect 4 vvill be in the; desired grippingposition when the eccentric portion onvthe actuating shaft 19 issubstantially on a dea-dy center. In that caseV there Will besubstantially no tendency for the collet toropen until the shaft 19 isintentionally-turned. f Y

What Ifclaimi's: Y A

l. In a chuck,a chuck body, a reciprocable member including acolletfitting said chuck body, Ya block having opposed .bearingV sur-V facestherein, adjustablefmeans for securing said block ,and saidreciprocable'member to* gether at theirfrear ends, and an actuatingposedbearingisurfaces on said block for r advancing and retracting saidreciprocable member.V ,j Y

2. In a chuck, a chuck body, a reciprocable member including afcolletyfitting said chuck'body, said reciprocable `member havingalongitudinally slotted portion,a block slidably,4 fitting in said"slotted portion, means for adjusting 'said'block to and fro'v; in saidreciprocable member, and means en gaging said block for moving the sameand saidreciprocable member in bothdirections to open and close .thecollet.

3. In a chuck, a chuck body, a reciproca ble member including a colletfitting said chuck body, a bearing block for said reciprocable member,one of said two last mentioned members being Vthreaded and. the otherhaving abutment means, a. nut to engage said threaded member and saidabutment .means for adjustably holding said bearing block andreciprocable member together, -and means engaging said bearing,different positions of adjustment of said block, and means at the rearendA of said plunger for adjustingsaid block relatively to said collet.'j 1 v 5. y A chuck of the class described compris` ing a head, atapered opening therein, al tav pered collet cooperating with thetapered Wall for expansible and contractible action, /aplungerconnectedto said collet and having a slot in its `free end, a blocklongitudinally movable'in the slot and having one end threaded, vsaidplunger also having an annular groove near its free end, a nutrothreadedend of said block, theslotted portion'of the block and'itheplunger having registering slots, the slot in the block being formedtransversely thereof, and a yshaft passing Ythrough the severaltransverse slots aridhaving an intermediate eccentric portion engageablewith the Walls ofthe slot in the block,'vvherebv 4they turningof theshaft reciprocates the plunger and the collet connected thereto. Y l

Y In testimony whereof I afliXmy signature.

` ROBERT S. lROI/ll.

tatable in said4 groove and threaded on Vthe j

